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1. When I use table and increase font, yes textarea not overlap button. but textarea increase size and exceed border of table so I cannot see some part of textarea because table border is on top.

2. I have more button, preview button, when I click preview button I can view detail that type in textarea and also still edit detail in textarea (like sitepoint). The problem is if I increase font size and click preview( I use PHP_SELF; ) when page reload again, the font still decrease not increase.

1. When I use table and increase font, yes textarea not overlap button. but textarea increase size and exceed border of table so I cannot see some part of textarea because table border is on top.

2. I have more button, preview button, when I click preview button I can view detail that type in textarea and also still edit detail in textarea (like sitepoint). The problem is if I increase font size and click preview( I use PHP_SELF; ) when page reload again, the font still decrease not increase.

Anyone help please?

Do you have absoult cell sizes <td width=50px>. Cause that will stay that size. Make it flexible <td width="10%">

It is turning into a php question. Are you sending the variables with the link. hmmm
<a href="blah.php?textsize=10">reload</a>

I placed your fields within a table and when the font was resized, the textarea did not overlap into the other cells. It did, however, lose its right and bottom boundaries into the netherworld, which means you lose the textarea's scrollbars.

Since I do not know what is in on the page with the code you posted, I can only provide some general suggestions: place the textarea within its own popUp window (winTextArea = window.open(....) ) or a div. And change the font changes appropriately (windTextArea.document.b.a.... or document.all[divID].b.a....)

Also, please note that the code I provided is IE specific. It will not work with NN4.